第1个回答 2020-04-27
二者都是情态动词
1.must是必须的意思,后面接动词原形,否定形式有两种,用mustn't时表示"禁止,不许";用needn't表示“无须”,一般将含must的句子改为否定句时用needn't。
2.need做情态动词时是“必要”的意思,后面接动词原形,例如:
I
need
hardly
tell
you
the
importance
of
the
work.(无须我说你也知道这个工作的重要性)
need做实义动词时表示“需要”,后面接名词或动名词,例如:
Do
you
need
any
help?
The
wall
needs
painting.
need还可以做名词,也表示“需要”。
第2个回答 2019-12-19
must表强制语气,用于疑问句、肯定句中,不能用于否定句中。eg:1.Must
I
leave
now?
2.It's
so
late,
he
must
come
back.
need表“需要”,可用于疑问句、肯定句中,也可用于否定句中,语气缓和。eg:1.Need
I
finish
the
homework
now?
2.I
need
a
history
book,will
you
borrow
me?
3.Here
didn't
need
your
help,you
can
go
home
now.
(请尊重个人劳动成果,请勿复制!THANK
YOU。)